Band Depopulation of Graphene Nanoribbons Induced by Chemical Gating with Amino Groups
ACS Nano - 2020
Jingcheng Li, Pedro Brandimarte, Manuel Vilas-Varela, Nestor Merino-Díez, César Moreno, Aitor Mugarza, Jaime Sáez Mollejo, Daniel Sánchez-Portal, Dimas G. de Oteyza, Martina Corso, Aran Garcia-Lekue, Diego Peña, and Jose Ignacio Pascual
Abstract
The electronic properties of graphene nanoribbons (GNRs) can be precisely tuned by chemical doping. Here we demonstrate that amino (NH2) functional groups attached at the edges of chiral GNRs (chGNRs) can efficiently gate the chGNRs and lead to the valence band (VB) depopulation on a metallic surface. The NH2-doped chGNRs are grown by on-surface synthesis on Au(111) using functionalized bianthracene precursors. Scanning tunneling spectroscopy resolves that the NH2 groups significantly upshift the bands of chGNRs, causing the Fermi level crossing of the VB onset of chGNRs. Through density functional theory simulations we confirm that the hole-doping behavior is due to an upward shift of the bands induced by the edge NH2 groups.
Press release
Our article was highlighted and discussed at Mapping Ignorance.
Bibtex citation
@Article{Li2020,
author = {Jingcheng Li and Pedro Brandimarte and Manuel Vilas-Varela and Nestor Merino-D{\'{i}}ez and C{\'{e}}sar Moreno and Aitor Mugarza and Jaime S{\'{a}}ez Mollejo and Daniel S{\'{a}}nchez-Portal and Dimas G. de Oteyza and Martina Corso and Aran Garcia-Lekue and Diego Pe{\~{n}}a and Jose Ignacio Pascual},
title = {Band Depopulation of Graphene Nanoribbons Induced by Chemical Gating with Amino Groups},
journal = {ACS Nano},
year = {2020},
volume = {14},
number = {2},
pages = {1895--1901},
issn = {1936--0851},
doi = {10.1021/acsnano.9b08162},
publisher = {American Chemical Society ({ACS})},
}
Key words
- scanning tunneling microscope
- density functional theory
- chiral graphene nanoribbons
- doping
- amino
- chemical gating
- band depopulation